linux-kernel - Re: [PATCH net-next] net: ixp4xx_eth: convert to ndo_hwtstamp_get() and ndo_hwtstamp

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Message-ID: <CACRpkdY58DH9O5g35Ai5PjE2gDSSbF1GodDNj94-xhPKfHURkw@mail.gmail.com>
Date: Mon, 12 May 2025 14:29:18 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: netdev@...r.kernel.org, Köry Maincent <kory.maincent@...tlin.com>, 
	Linus Walleij <linusw@...nel.org>, Imre Kaloz <kaloz@...nwrt.org>, 
	linux-arm-kernel@...ts.infradead.org, Andrew Lunn <andrew@...n.ch>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
	Richard Cochran <richardcochran@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: ixp4xx_eth: convert to ndo_hwtstamp_get()
 and ndo_hwtstamp_set()

On Thu, May 8, 2025 at 11:12 PM Vladimir Oltean <vladimir.oltean@....com> wrote:

> New timestamping API was introduced in commit 66f7223039c0 ("net: add
> NDOs for configuring hardware timestamping") from kernel v6.6. It is
> time to convert the intel ixp4xx ethernet driver to the new API, so that
> the ndo_eth_ioctl() path can be removed completely.
>
> hwtstamp_get() and hwtstamp_set() are only called if netif_running()
> when the code path is engaged through the legacy ioctl. As I don't
> want to make an unnecessary functional change which I can't test,
> preserve that restriction when going through the new operations.
>
> When cpu_is_ixp46x() is false, the execution of SIOCGHWTSTAMP and
> SIOCSHWTSTAMP falls through to phy_mii_ioctl(), which may process it in
> case of a timestamping PHY, or may return -EOPNOTSUPP. In the new API,
> the core handles timestamping PHYs directly and does not call the netdev
> driver, so just return -EOPNOTSUPP directly for equivalent logic.
>
> A gratuitous change I chose to do anyway is prefixing hwtstamp_get() and
> hwtstamp_set() with the driver name, ipx4xx. This reflects modern coding
> sensibilities, and we are touching the involved lines anyway.
>
> The remainder of eth_ioctl() is exactly equivalent to
> phy_do_ioctl_running(), so use that.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Overall looks good to me:
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij